FOX NFL insider Jay Glazer explained how authorities zeroed in on the suspect.

“Here’s actually what happened. The FBI and the NFL security, along with Patriots security and the Houston PD, they actually went through all this video to try and track somebody down, and they zeroed in on somebody, a person of interest,” Galzer said Monday.

“From what I’m told, they have him going into the locker room right behind Bill Belichick as if he’s with the team. Goes in there, loiters around a little while and is seen leaving the locker room … a little bit later with something under his arm,” Glazer said.

The jerseys are in the possession of the FBI in Boston, and law enforcement was working to authenticate them.